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  • Do you ever lie on your back outside on a sunny day?

  • There's so much to see!

  • There are birds, and airplanes, and maybe even clouds, all way up in a pretty blue sky.

  • But why is the sky blue?

  • Why not green, or red, or any other color?

  • It all starts with light from our big, bright sun.

  • Now, it may not /look/ like it, but the light from the sun is made of all of the colors

  • of the rainbow.

  • And you might already know that it takes /many/ colors to make up a rainbowred, orange,

  • yellow, green, blue, and violet!

  • All of the colors of the rainbow are in sunlight, /all/ of the time.

  • It's just that they're all mixed together, so we don't see them /most/ of the time!

  • It's kind of like when you're painting and you mix together all the colors.

  • With paint, mixing all the colors makes brown, but when you mix together all the colors of

  • light, you get white light.

  • You can actually see the different colors in light sometimes!

  • One way to do it is by using a special tool called a prism, which is usually just a specially-shaped

  • piece of glass or plastic.

  • But you can even make a prism out of a glass of water!

  • Prisms bend light in a special way, so that we can see all of the colors that make up

  • light.

  • Say that I shine a bright flashlight into a prism.

  • The rays of light move in a straight line away from the flashlight.

  • When the light hits the prism, it separates into lots of different colors, and we have

  • a rainbow.

  • So, the light is white when it moves in a straight line until it hits the prism.

  • Then, it bends, and we can see colors.

  • That's a little like what happens to the light from the sun.

  • Rays of light leave the sun in a straight line, too, as they move through outer space.

  • They stay in a straight line until they reach the layer of air that surrounds the Earth.

  • Now, the air around the Earth is made of tiny little particles, or pieces, that we can't

  • see.

  • But they're there!

  • If you try moving your hand back and forth really quickly through the air, you'll feel

  • the air moving past your hand.

  • What you're really feeling is all those little particles!

  • When the rays of light hit these tiny particles of air, they don't just bend, like they

  • did when they hit the prism.

  • The light rays scatter, meaning that they go off in lots of directions, and bounce around.

  • And here's the cool thingsome of the colors scatter more than others.

  • What color do you think scatters more?

  • [Squeaks guesses]

  • Right you are, Squeaks!

  • Blue!

  • Blue is one of the colors of light that scatters the most!

  • So, as light from the sun moves into the air that's way high up, the blue-colored light

  • bounces all over the place in the sky.

  • So when we look up, our eyes see a lovely blue sky.

  • But a lot has to happen to turn it blue!

  • So the next time you're outside, don't forget to look up.

  • You never know what you might see!

  • Thanks for joining us for this episode of SciShow Kids!

  • If you want to watch more videos with me and Squeaks and you're watching this on YouTube,

  • you can click the red subscribe button.

Do you ever lie on your back outside on a sunny day?

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B1 US prism straight line rainbow sky sun air

Why Is the Sky Blue? | Physics for Kids

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    joey joey posted on 2021/05/10
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